Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b010d01ee64e26…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 18:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f5965d3785890b3da7c378384917289 SHA-1: 1fc8fc1b0b115bdc31066e4311c609838b27cd7b SHA-256: f3b010d01ee64e264df40c3cbc95eaa5cd121434ce41f151d319aba3393ae431
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload storage or disposable hosting. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick users into calling a phone number, a common tactic for callback phishing or tech support scams. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=create+pdf+c%23+windows+application PDF link annotation
    • https://stopserv.ru/files/file/vibesub.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/28050685473.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pefurizoroxubat.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zupotozibik.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/tezorilaxezupijofawupuse.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-29/20210829134840360329.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/rubutixonurixafedukuzo.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/75965022611.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc65be744---puvobikinupineti.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/zigelevalop.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e0db632331ad6e6d51673d4257b0ab50/57468046994.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/xixonanotaxikuxuja.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/85416383012.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zuxukinudojaravuxedini.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/72553385640.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f984f158cc8fb35271dc77eca781f6d1/43789088291.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/16961113031.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/saomoem6qdd1vm5hotjhjgcns3/fatugufupikavaraxuduz.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16293122760967.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/88004043025.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218102350351868.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/96934086549.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 18820 bytes
SHA-256: 8ad973cab8fdf324c1f0a41e44a7d48511f20fdd3e035e4a9f3f7ada97a204f9
font_01_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 10112 bytes
SHA-256: 3ea7b75d8c9ebbdc94df890c2700e2c336a88ee96a11631b4f2d84a1d40aeeb1

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